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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d292665e9b53abb0cd1b8b8eb852f46510af61be7ab388c237d0489c6d0657' 
  AND token = '2eedWh30DJopvMhspU8JAs1J6hTEYhKKDW0vwupR3sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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