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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98806bed4707d7cf909d0ca28afbb15d6286508299b905fc5d6ddb72c69d0fd0' 
  AND token = 'z1hoUGpcfU4YkGMzJERk1hVoJsWvRMuzUZNSGhbzh/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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