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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ba3c5c75f8322c6852a07c59def3965f9c20340fcd8df39c9005bc5a313cb4' 
  AND token = '4a0uIJhJfDmsBRbpQ5/Od7FTl3jgp9OUiSNMiKUUkw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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