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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e612900b55af7e20b9106df5f88b8ba04158222049189ae47e647a87221954c' 
  AND token = 'KOlnoFagY7hZuHqztDxdlA8t2Wvk73t87UF/aiq9jAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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