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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c0ee561742ddbcc5d43408a6040905aa0605542f10ef0463086c8e183cae89' 
  AND token = 'ZAfIgL1NrCyya50PW3te7qQ1KpkmYdsjQw9piVSBEEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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