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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c83efee82db064fb7f4e30fb66de79ed854eb442c3ac3117d4df6e49e9c46c2' 
  AND token = 'zRAE2sn0R6DvGW+dQftJbrxx0up/eXcAmAVzh3q+ysU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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