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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf60f2fcd386555890506ecb1b39cfe0a5b8d7de35f0a02573f5032cfdae4dff' 
  AND token = 'DLPSr6DPYro9D+B1G0U4/qVoXGn6pKj4kRVI+RCT2Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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