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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e11871f00ad4fa33e2bc6e831e551a3dd7c51dc23fd5f28a6d114b7bdcb3e4' 
  AND token = '1SzSIa0/xZHUC2zQF3OAYXPCCJcFYV1cfrb0WRqxf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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