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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9f94462253a742549c3fc6b561f7ca292879d1fbbd0971fa93f2e58eae1814' 
  AND token = 'Elmhb9Fl+ZMrsfyxkVe0T3hqfm3DkU5d8dUJyxoojfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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