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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10565788dd26a9341a186509d1006e81a368dec4bc547be615091d586a343087' 
  AND token = 'iPGqBWdTd3YZnxj4pKb6tuJupfn5F4W8DZ5AY1kUm0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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