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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7537ca5130615bef99917683ecff23002bdd6e7a8736a4b94fda5a070ef66f90' 
  AND token = '2FH9dHb6iimn9vv0G87bok81Izk0PJtjdIizfOt4fYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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