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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e524b83f49bbab45bda2212978f9c108c5a9655e74ee9e52d0047ba9f765801' 
  AND token = 'CZQDCQbhCqd2b9uETG6mjXZY9ytdClYy1k0Bfn6GyXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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