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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a3fe0fe98fe666fd7253c12d444785a7393cf802c8630f0dc68fca7090b16b' 
  AND token = 'SdhTzOAE0DoTNEgQ6rFVj9/NczKkRJEQgpJu0YV3u3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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