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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b62fa4c8429f409abe3830bd5aa48ab3e9e48339bfd8386a2ffdd76387d2af' 
  AND token = 'GCDEYrxRZ5JrIQzazTefr74L/2Me5GGN+6H6hU/ADDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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