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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdba9b81869ecbb6ba7a56071f53824e68d0ff3da2d883ee5d999499410911f' 
  AND token = 'eVKBwmUgqfrOdefCmL3fRtnsxqNRDynw3q2Z/eNLYx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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