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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cf8d0423ebed9f77ff75be5c3be249f0aebb7504ac197bda24d3311b8203d9' 
  AND token = '4dx1BsfYg4NNCZ9ZvNUudYtjfvRkD13ZXn6IkWH+yoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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