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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a5547a20e0d0b1ff77410866b3a43d89fd88e4864b6d98e3db3b2d65569484' 
  AND token = '6Zh+uq9cjRpL9Y+i86sdwbC+PRxn183nkp8P0FaZ+xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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