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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb12dbfff500b2f362b000e1fa9baf5e2e9f8f7d00380fed991f1b7a8772496a' 
  AND token = '4pXQNRoxRQDbfZxJbhBf6bGZHeKof/MVE27TQSdbnbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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