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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90d3c5fbaa33dbcc9f08a1f61e9b81f5b2f33478bdca1e00c30a4f4d152fd40' 
  AND token = 'rxBa7RB/zkdKfPZmw8ty3o9xdOfoVHpXWyxzfq2tWLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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