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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d777b7053afca5a87822d296c52e258b5cc7ef404dfdd2c3e7be470c0b2f5' 
  AND token = 'sKoqB1pOBBgPdhBQFA8B/oNFGRntMntN7z20Yp8MCKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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