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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb5bcdd1526efe03bc2496ab638b412d4bf832b1c78315e7a734c2b012fc780' 
  AND token = 'w6+G5MQiJduFbOOOxue+kjVKVUZe4PNtwrZq5tOot+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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