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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac10307bf01be6b2265123af3d16e812f6344ba417e4f7d292c933b0e7c033dc' 
  AND token = 'shTzW3FW8449YOBQhrbBRu0GlHn0vYJOfVdjYbYET6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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