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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c8cb7d5fe44b0e5d4b51361434af42a16124d811182e92c8b4c6f53d83610c' 
  AND token = 'vrvGiyybvlL7blf8ymGUMpCBi+DIPddQx5qBP0f1y+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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