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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab94b424c30f16097a75b6cc497b6d790145e85889847c17172014b50788798' 
  AND token = 'BuxjY8RchcvgQArl+cm6/fIEhdKCC5MvY+/cQIWyUBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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