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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03d70a010645f7c8056180296ff9ace75ba6f5ad0ea78abfe062ea20dc6c31f' 
  AND token = 'RuN/HqYELnk4IBC6JW2vHNo9JFhucvO7l6DXDQUAQ/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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