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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c76d0422be6cda426a706705254cc202c5f046d539028ed74866fda63ef60a0' 
  AND token = 'CLsGCj+BBd4rsVPZ20ox3ZsgXHdhjCmCmiDRGZqCrAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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