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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec571ad1bcbaaa28c803f25b0ef2519c347e2327602bdaaee1e3b7840a594b9' 
  AND token = '11zSfNQUyh5nPRPnp2F2y/bG8besq1X4Q6CRzPs5PbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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