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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a37f132abe1c6b759252c58412dba5c2b7bb7f4c98ad97bf74b417fd8d801e1' 
  AND token = 'PlpHltuwK6UH2UxWu4rQ6zvJnjrRSyStcnlPPVqTwKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}