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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07e21021a1eb36b76f98c2fada9c987fdb22ce8e6ec0722c2dfd0570252b4c6' 
  AND token = 'eIgBGAjAIQ6W9MNnoZC9xmCal4yEbct1Gtp/j62f8ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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