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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df914123eb542ab0b961f984430937096b581ecedaa40ec7469d08cb341dd82e' 
  AND token = '88vHmeYDEbDEEcp3/i4vnIoqI1+ifrflqWEXCMWw6vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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