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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b710bda568c9e5fbf3dd4ced4467750dcc06ad334f958d5ee9e6a727e681f8' 
  AND token = 'OYYcUl33fM5FkkXSOToWQuHLyrfU2G/s8frqCwY6ldg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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