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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660d496d530a4226f008ac3ced6710389c29975e3cccae488feac90eba00d1c6' 
  AND token = '9lARZDEZd1UA2kLQKM0nWc4x7/TEWSl2pxPQ5HrCf6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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