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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa85c32c6782ea71f698ab71bbeda8de6bdf07429efe5a81e2304b9fcc7cb93' 
  AND token = 'ZZYqXkTu8LEVLf+387v2FIYXSJ8UfHHFon8IFedIdsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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