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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fc8be1f1eb3b241ca80cd87ad24d34a6566ad6ab059680fa1850a1f8055d9b' 
  AND token = 'pptoZQgbeETPm2Cas4iwa4TXd8hpegyGoonDbq90dto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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