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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699a6a1aa34efe27143e1b749dfff25d253196bba078ca8faa81ff94c62797de' 
  AND token = '+oC7P5riFfkLmahZ8HFss789RURE13MaXW/tC+QBRsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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