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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe62edc12e33c0e98cdb836ffbe565696a779c9e451061c735134ac0ca6a1b2' 
  AND token = 'Oe36+vIxZsJcvQpVO0Jhnwzs36Jy16vdhq1paPiFfIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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