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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46726642cbac1ec521d1571cc4cf53cbb6b46ad4253a79474a50e9a1f70f6854' 
  AND token = 'fdRroXikrKnVGPcQAMWDCrqgZ8O9qJ3VbD/PqUFl4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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