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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a565b37f8e731a829ec7037947fe89a9be15297f7e945f852191ead33a70ad' 
  AND token = 'Hdk9Rqr8thNvTSccMw5JIv81x+h6V1q8DqMKtQaOt/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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