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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adce40d33dc274d30ca2e90885760cef7cff36cf0fe51b88fb5f19dc18534776' 
  AND token = 'rFn0pX4GJ2QrQygqVaFALmoe1AvRCH6/i+8pPH3XH50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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