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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14e150733faaa3c98e6f2057c52f3992075764b7bef8674811ffeda33b3983f' 
  AND token = 'WAuJ6e0SXeYlLTexREyz4Zs6szeVD2oophWYLQ2V8E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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