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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b940f5d1e3a74e0a37b096077afbd1bb5254b0ef0ae4625124a8aa4a2735dda' 
  AND token = 'pZGLbbq0omPDaJXh5T6woAo2UHOc8LfLB8/vSo16/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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