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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59555afee5d38a7dffe2f48452a6feb25ca7307584b74d728dc13c7fe06c5032' 
  AND token = 'hOjx3J4rafp0yEfSvXjjMdR/GOaydlxkA0ZAM7+Kvvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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