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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff08c5687cc5531f037bc1791e5dea8858b91c8a7b5523e9f206a194f93c9d6c' 
  AND token = 'givbZ3aFNo0nU2X6uJTsWIWdBuNhNW4C7L9f7oz46hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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