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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5e547d2d9667a9dc982595c6b2de8f0ccc0b1ba550bc4f66ed9c1cc2b3aaff' 
  AND token = 'izfjsl5ZhdSBYkdgZflXPyKsCmcm+Ht1oXqEdZkXuqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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