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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212670fb752c7df17e7513cbc866128fe69d0619dec2643e6cbb5bbcc4a4c459' 
  AND token = 'eSc+cFNzm9Prztmq0k30Az+2W3sPteslAvg9XCeFq/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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