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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b11faac7eb26b52c733f1824996b1a31c0b5f8c4111eb17699dab5ca2abff5' 
  AND token = '1ax84wrtoA4DK7EjZ2VEZA+30xjV3Zk4wYstiuJSLRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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