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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5342bce15156649eaf7b45848a1934ef7c5ce1ba1fac632aa91c58ebc5a9d44c' 
  AND token = 'AQJ5IDamwO0/6PHTyJv7L9rjMs2/SFHr6joPJ8SikIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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