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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11a87964f32c9f3d434278334a93695056d2fdc19c6c87fbd36c888c9b8bcf4' 
  AND token = 'wvOF88dqi87Wju9747Jlu+yOkq0WbZqcanuP2dzE9OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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