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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad02093b4736a677c20a2e4f230825b7d5f26718e7cc3c8693afb9eef2db8563' 
  AND token = 'rOGdiXvcoejFqwy4xL8dxECQ4743GNhh3vmNymHt4pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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