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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598199779db87bbc76676d8aab9c017e9f1ec8ed46e4db5fc80c130523280f7c' 
  AND token = '/VLMYC6NsPEo7YK1jkLoe8qIMCa9gpT1Lu3KGH4fVzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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