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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6c3166b4ccbde87635c9014243fa134c429a3d396bc2806226f7553ed6b3ef' 
  AND token = 'DgOag6Z3L1qvEZReLsiaMSuLg5hlpGjoiNSAuht2+3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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