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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6becf3e4987050178d67714d82566f39e389c10f3b610171e5ec3e58a55656b8' 
  AND token = 'ZN/asr7bnZXuKv+Dk+8lRvxjK06F+0Kljc8Zd/ItsLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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