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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3b2538b593c42d8711dfb44d6b063b1ba0c744acbba200c71b851ffac4d07a' 
  AND token = 'aym3AR6XfJmG8mkf1+2lrBhBUbhCJlJiC65ZAH9iK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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