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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c8c4bf30657214978cb2914253960089890d66020cd97cc6eafd8670418839' 
  AND token = 'Twuw3PE1pHxMpX6V+dJgXymv7PFLuJB0nEH+dvJ/7sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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