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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c4b084c7ecbddc5efabb1b1b84861ebb36edf9c5097043e10591cc05aaa4df' 
  AND token = 'bA8P/STZaVwiaFSHEU0ip13e+fzvbY4xgUoPJneusLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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