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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2be284ce4669dbb4d8c69ddf40dc3dc20277a3e73bb6aa38ae8e322cd729a4' 
  AND token = 'Dn5MdUPkHzdFIJjCxQT9f+1/ooSLcY+lzM9l0UEbTNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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