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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2ad17f5fbdf77668af2bc219b7d71f713a4d48730a43997149508b6a39759d' 
  AND token = 'CRbO42nL0G4u9Hnljy4MzQ1eUOOaXmFl7FN7WzkwHIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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