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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199bdd70362ac26f45ec8f3a6f15b68f2217ad213631ec8a1e935997c2373e70' 
  AND token = 'TYsvAIX8fr/HhdohcT7rNCHOZ/u9dxjZ30WHeTrsXE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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