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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36c28ea2a013ad93863c65acf295456c03fa8be79117ff1a77a24aa2cd8310d' 
  AND token = 'inBD2P5PnLUH3YOz1IBW6B7Ab+7SnvlDVanDSFEB0JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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