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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f289da14259e00c11c27360ea6bd89e7ec41827306a8e23a611d5b949d2eb0' 
  AND token = 'lKF+STyeHYzmafLmkGlWGrCbPB553Llzw5UMvL9hkTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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