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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4767e78997e03518470d84a68a6c6726006c79adbbaea49633fd39924d4adf' 
  AND token = 'dDWUajTlM7A3/R53ZJo+zAKRpLKEEmijeTQaZ1IShG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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