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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52727c66e8b552bb6fb2f47a5acd5bdc40e68c6597280f937e5dd42dfa67923e' 
  AND token = '60qVk9hNDe2mHaQrDKsuQjawb7H//gSgOfFKVAq+I9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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