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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6ba4e9d54ba8aa8fea96047d1ddc0e48177c7fc99ec80258d174bcfa5c899d' 
  AND token = '6aok7uRNheSirTVn2nsP9kwHNQIJYLppYVLb996FS3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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