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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce902ea65fc63e6c9263fa5dee2f525235b33c63db7bd808f5e346f87423063' 
  AND token = 'YSBSj8kEVtDyJff4kpsqmxzHVxhiEmguBkjN7m7H8kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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