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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98b71427b2ea3272b7fd8c2adf1de292721f2d97bb0e3c188fbb3ca270bb323' 
  AND token = 'CmeyKkaOUE5/zVz+eSaB8khiKIhW7LIL9159PWGSckc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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