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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfe376797b08e1756c9bf84e4cfb54cc947c19553d92e6d6db7b5cde5dc82f2' 
  AND token = 'JCeyVlXJ4PrL7LfcUPZ/Y3X/PZ9+Xcy3RmPtr6kv2Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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