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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99beebd0997711c9472640252474acf8a080662f17de6cfcf037637e8d1f5915' 
  AND token = 'lgxLqhDKwAxrWFi1jUL4Y9/pfrDEWucg1ugXFe2rBk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00211

JSON explain

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