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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac592e580e0c6fb5c0612079ecdae97bce75df55ed22226f18299cbc8fe1166' 
  AND token = 'Vlw8uNjIkWXWQjC3Z1BWLvPwVnazMT1KtD69jTfVdiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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