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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce13cd594e84a7c5a4c932daa66e5d6c3ffc1800c581efb67a692366b0e513b5' 
  AND token = '7QfC7J9N9Yaor64i0+fsOOIuNxxbn40CSZllLuJqSpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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