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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2979ecf163066882edba47d1a0fa81d0181afea555ef93cb5f30e76fc4c7ab59' 
  AND token = 'aaX2wsG8lS8Bfb6OnuQcWkYXXwWLFc34xzHQHrKgqw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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