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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbd50efb1ea53652709efa0cae66281699592d34c0e240c05b6f6ea38256927' 
  AND token = 'AKgQxZ2j1Kc10YW0Us/q6K0XRiy/Ql/e1387/eN6ePI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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