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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e4e850d6fdfb28f88afc8ad19ed5363ee182c2d4475a32fe279dccd774d99f' 
  AND token = '8RoIAze9F2H1R4BMkqX+YSJs5s/my+IgpkXyj7RlxEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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